Career
Castellan (hövitsman) at Borgholm Castle in 1436, Stäket in 1438, and Nyköping Castle in 1442. Dubbed as knight by King Christopher of Bavaria following his coronation in 1441. Nils Jönsson was son of important nobles and landowners: his mother lady Märta Finvidsdotter was the heiress of the Frössvik high-noble family, and his father Jöns Bengtsson was son and one of the heirs of lady Ingeborg Nilsdotter (from family that is called the earliest Sparre in later historiography and genealogy), heiress of Ängsö and Salsta.
Jöns Bengtsson inherited Frössvik (in Uppland) from mother and Ängsö (in Västmanland) from father.
Nils is credited for having founded the castle of Djursholm in his lands. From his two earlier marriages, Nils did not succeed to have any surviving heirs.
